package com.zb.oauth.service.impl;

import com.zb.oauth.service.MyAuthService;
import com.zb.oauth.util.AuthToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.util.Base64Utils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.io.UnsupportedEncodingException;
import java.util.Map;

@Service
public class MyAuthServiceImpl implements MyAuthService {

    @Autowired
    private RestTemplate restTemplate;

    @Override
    public AuthToken login(String username, String passwd, String clientId, String clientSecret) {

        String url = "http://auth-server/oauth/token";
        MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
        body.add("grant_type", "password");
        body.add("username", username);
        body.add("password", passwd);

        MultiValueMap<String, String> header = new LinkedMultiValueMap<>();
        header.add("authorization", this.getHeaderData(clientId, clientSecret));
        //发起远程调用http 请求
        ResponseEntity<Map> responseEntity = null;
        try {
            responseEntity = restTemplate.exchange(url, HttpMethod.POST, new HttpEntity<>(body, header), Map.class);
        } catch (RuntimeException e) {
            e.printStackTrace();
            throw new RuntimeException("调用/oauth/token异常");
        }
        Map<String, String> result = responseEntity.getBody();
        System.out.println(result);
        AuthToken authToken = new AuthToken();
        authToken.setAccessToken(result.get("access_token"));
        authToken.setRefreshToken(result.get("refresh_token"));
        authToken.setJti(result.get("jti"));
        return authToken;
    }

    private String getHeaderData(String clientId, String clientSecret) {
        //Basic emhvbmdibzp6aG9uZ2Jv
        //      emhvbmdibzp6aG9uZ2Jv
        String str = clientId + ":" + clientSecret;
        byte[] encode = Base64Utils.encode(str.getBytes());
        try {
            return "Basic " + new String(encode, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return "";
    }


}
